Security Bulletin
Summary
Open Source OpenSSL and Samba are used by IBM Netezza Host Management. IBM Netezza Host Management has addressed the applicable CVEs
Vulnerability Details
CVEID: CVE-2017-3731
DESCRIPTION: OpenSSL is vulnerable to a denial of service, caused by an out-of-bounds read when using a specific cipher. By sending specially crafted truncated packets, a remote attacker could exploit this vulnerability using CHACHA20/POLY1305 to cause the application to crash.
CVSS Base Score: 5.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/121312 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
CVEID: CVE-2017-3732
DESCRIPTION: OpenSSL could allow a remote attacker to obtain sensitive information, caused by a propagation error in the BN_mod_exp() function. An attacker could exploit this vulnerability to obtain information about the private key.
CVSS Base Score: 5.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/121313 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
CVEID: CVE-2016-2126
DESCRIPTION: Samba could allow a remote authenticated attacker to gain elevated privileges on the system, caused by the failure of handling the PAC checksum. By using a specially-crafted Kerberos ticket, an authenticated attacker could exploit this vulnerability to gain privileges or cause the winbindd process to crash.
CVSS Base Score: 6.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/119906 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L)
CVEID: CVE-2016-2125
DESCRIPTION: Samba could allow a remote authenticated attacker to gain elevated privileges on the system, caused by forwarding a Ticket Granting Ticket (TGT) to other service when using Kerberos authentication. An attacker could exploit this vulnerability to impersonate the authenticated user and gain elevated privileges on the system.
CVSS Base Score: 8.8
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/119968 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Affected Products and Versions
- IBM Netezza Host Management 5.2.1.0 - 5.4.10.0
Remediation/Fixes
To resolve the above reported CVEs on all PureData System for Analytics N200x and N3001 platforms, and to resolve CVE-2017-3731 and CVE-2017-3732 on the following platforms:
PureData System for Analytics N1001
IBM Netezza High Capacity Appliance C1000
IBM Netezza 1000
IBM Netezza 100
update to the following IBM Netezza Host Management release:
| Product | VRMF | Remediation/First Fix |
| IBM Netezza Host Management | 5.4.11.0 | Link to Fix Central |
The Netezza Host Management software contains the latest RHEL updates for the operating systems certified for use on IBM Netezza/PureData System for Analytics appliances. IBM recommends upgrading to the latest Netezza Host Management version to ensure that your hosts have the latest fixes, security changes, and operating system updates. IBM Support can assist you with planning for the Netezza Host Management and operating system upgrades to your appliances.
For more details on IBM Netezza Host Management security patching:
Workarounds and Mitigations
Mitigation of CVE-2016-2126 and CVE-2016-2125 applies to the following platforms only:
PureData System for Analytics N1001
IBM Netezza High Capacity Appliance C1000
IBM Netezza 1000
IBM Netezza 100
Execute steps as "root" user on both ha1/ha2 hosts
Step 1. Check if Samba module is installed in the host
[host]# rpm -qa | grep samba
Step 2. Check if Samba service is running
[host]# /etc/init.d/smb status
Step 3. If Samba service is running, stop the smb service
[host]# /etc/init.d/smb stop
Step 4. Backup the /etc/samba/smb.conf file
[host]# cp /etc/samba/smb.conf /etc/samba/smb.conf_backup
Step 5. Edit the /etc/samba/smb.conf to include the global setting as shown below:
#============ Global Settings ==========
[global]
machine password timeout = 0
Step 6. Start the smb services using below command:
[host]# /etc/init.d/smb start
Note : If the Samba service is enabled in the future, follow Steps 2 to 6 to mitigate this issue.
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References
Change History
31March 2017: Original version published
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
Disclaimer
Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.
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Document Information
Modified date:
17 October 2019
UID
swg22000291